Perhaps you should try some spelling variations:
chang nang » chang wang, thong nang, chai nang
hieu lang » chieu sang, hieu quang, nhieu tang
hieu manh » chieu xanh, hieu nganh, dieu hanh
bang cong » dang cong, bang song, hang cong
cao bang » cao dang, cao tang, cao nang
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (hieu manh)) - chang nang cao bang cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (hieu manh)) - chang nang cao bang cong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (hieu manh)) - chang nang cao bang cong tap toan ban*.